Someone whose intelligence, or lack thereof, is seasonal and inconsistent. (See also perennial dumbass.)
"Sometimes they can be really smart, but other times they say the dumbest shit, you never know what you're gonna get. God, they are such a deciduous dumbass."
by Honeydew Melon Hater July 12, 2022

Another word for the lottery, as coined by bill nye and idubbbz. It essentially forces poor people who don't know enough about math, pay a sum of money and get nothing in return.
darren: "You hear about that hundred million dollar end of year lottery? The ticket line went for miles.."
davo: "that's what you call the mandatory dumbass tax"
davo: "that's what you call the mandatory dumbass tax"
by aussiegamercop November 20, 2018

by Honeydew Melon Hater June 10, 2022

Then the contestant, reacting to the audience's laughter after she identified the author of The Three Musketeers as "Alexander Dumbass", said, "No...wait... Henry Dumbass!" -- from the Pardon My Blooper album, 1957.
by Zappin' Nap March 31, 2020

by Pee-wee Jones April 21, 2020

When someone isn't actually a dumbass but they act as one due to a lack of care on the opinions other people might have on them
by SumRendomDumbass October 14, 2019
